<template>
  <div class="todo-footer">
    <label>
      <input type="checkbox" v-model="allCheck"/>
    </label>
    <span>
          <span>已完成{{ completeSize }}</span> / 全部{{ todos.length }}
        </span>
    <button class="btn btn-danger" @click="clearComplete" v-show="todos.length >0">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "TodoFooter",
  data() {
    return {}
  },
  computed: {
    completeSize() {
      return this.todos.filter(todo => todo.complete == true).length
    },

    allCheck: {
      get() {
        return this.completeSize == this.todos.length && this.todos.length > 0
      },
      set(value) {
          this.todos.forEach(todo => todo.complete = value)
      }
    }
  },
  props: {
    todos: Array,
    clearAllComplete:Function
  },
  methods:{
    clearComplete(){
      this.clearAllComplete();
    }
  }
}
</script>

<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
